Consolidated Statement of Shareholders' Equity - USD ($) $ in Millions	Total	Ordinary Shares	Additional Paid-in Capital	Treasury Shares	Accumulated Other Comprehensive Loss	Retained Earnings	Total Equity of MKHL	Non-controlling Interest
Beginning balance at Apr. 02, 2016					$ (80.9)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 307.0
Other comprehensive income					1.1
Comprehensive income	$ 308.1
Ending balance at Oct. 01, 2016					(79.8)
Beginning balance (in shares) at Apr. 01, 2017	209,332,493	209,332,000
Beginning balance (in shares) at Apr. 01, 2017	(53,499,189)			(53,499,000)
Beginning balance at Apr. 01, 2017	$ 1,595.0	$ 0.0	$ 767.8	$ (2,654.9)	(80.6)	$ 3,560.3	$ 1,592.6	$ 2.4
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	328.2					328.4	328.4	(0.2)
Other comprehensive income	21.0				21.0		21.0	0.0
Comprehensive income	349.2						349.4	(0.2)
Partial repurchase of non-controlling interest	(0.5)		0.5				0.5	(1.0)
Vesting of restricted awards, net of forfeitures (in shares)		462,000
Exercises of employee share options (in shares)		406,000
Exercises of employee share options	3.0		3.0				3.0
Equity compensation expense	21.1		21.1				21.1
Purchase of treasury shares (in shares)				(4,635,000)
Purchase of treasury shares	(160.9)			$ (160.9)			(160.9)
Redemption of capital/dividends	(1.2)					(0.2)	(0.2)	(1.0)
Other	$ (0.5)		(0.5)				(0.5)
Ending balance (in shares) at Sep. 30, 2017	210,200,479	210,200,000
Ending balance (in shares) at Sep. 30, 2017	(58,133,811)			(58,134,000)
Ending balance at Sep. 30, 2017	$ 1,805.2	$ 0.0	$ 791.9	$ (2,815.8)	$ (59.6)	$ 3,888.5	$ 1,805.0	$ 0.2